My laptop hasn't had stickers since a CTO asked why mine didn't have any stickers like the ones on the laptops of his cool cloud team. Personally I've found laptop stickers bad taste since then.
My work laptop has a company sticker on it. If I'm at a customer's office I'd like everyone to know I don't work for them. TSA also has this really neat trick where my laptop has gotten "lost" several times going through security. I have to describe the laptop in order to get it back. If I don't have an identifying sticker it's basically impossbile to uniquely identify it